The Vélodrome d’Hiver (French pronunciation: [velɔdʁɔm divɛʁ], Winter Velodrome), colloquially Vel’ d’Hiv, was an indoor bicycle racing cycle track and stadium (velodrome) on rue Nélaton, not far from the Eiffel Tower in Paris. As well as track cycling, it was used for ice hockey, wrestling, boxing, roller-skating, circuses, spectaculars, and demonstrations. It was the first permanent indoor track in France and the name persisted for other indoor tracks built subsequently.
In July 1942, French police, acting under orders from the German authorities in Occupied Paris, used the velodrome to hold thousands of Jews who were victims in a mass arrest. The Jews were held at the velodrome before they were moved to a concentration camp in the Parisian suburbs at Drancy, then to the extermination camp at Auschwitz. The incident became known as the “Vel’ d’Hiv Roundup” (Rafle du Vel’ d’Hiv).
http://en.wikipedia.org/wiki/V%C3%A9lodrome_d%27hiver